Improvement in tube-fastenings for steam-boilers



D. HESS.

TUBE-FASTENING Fon sTEAM-BoIIJ-Ens.

No.187',38z, Patented Feb.1s,1e77. v

wmlissis: INVENTUM ATTORNEYS.

N.FETERS, PNOTD-LITHOGRAPNER. WASHINGTON D C DANIEL HESS, OF GREENVILLE, MISSISSIIPI.

IMPROVEMENT IN TUBE-FASTENlNGS FOR STEAM-BOILERS.

Specification forming part of Letters Patent N o. l 87,3552, dated February 13, 1877; application led l v January 30, 1877. l i

To all whom #may concern:

Be it known that I, DANIEL HEss, of Greenville, in the county of Washington and State ends, thus forming a circular flange or lip thereon. An improvement upon thismethod is to countersink the apertures in the tubesheets, through which the fire-tubes are inserted, and to apply circular nuts, which are screw-threaded exteriorly, to adapt them to be screwed into the recesses, and also constructed with a circular opening or socket to receive the ends ofthe tubes. The tubes are secured solely by the pressure of' rubber packing placed behind the nuts, and the latter project from the face of the tube-sheets.

The object of my invention is to remedy the objections of these methods. For this purpose the ends of the tubes are screw-threaded exteriorly and the nuts provided with corresponding screw-threads internally, so that when the nuts are screwed home the tubes are firmly secured in place, and also become or act as so many rigidestays for the tubesheets. The-construction and function ofthe nuts enable them to be made thin, so that they will lie flush with the face or outer side ot' the tube-sheets.

In the accompanying drawing, 'ormin g part of this specification, the tire-tubes A and tubesheets B B of the boiler have the local relation usual in steam-boilers. The ends of the tubes are screw-threaded, and nuts G are screwed thereon, as shown. The holes or apertures in the tubesheets, through which the tubes pass, are countersunk, as shown, to adapt them to receive the "said nuts U when screwed home, for the purpose of fastening or securing the tubes. The form ot' countersink or cavity may be varied or changed, but that I have represented in the drawing has its sides I at right angles to the oor or bottom thereof. The l'orm of the nut will, of course, correspond to that of the cavity. rlhe nuts are provided with nicks or recesses to enable a suitable wrench to be applied for screwing them on or off the tubes. A suitable packing is placed in each countersink around the respective The combination ot' the annular nuts C screw-threaded internally and having a smootl or plain surface exteriorly, the lire-tubes having their ends screw-threaded externally, and the tube-sheets B B provided with apertures countersunk to a depth equal to or greater than the thickness of the nuts to adapt them to receive the latter, as and for the purpose specified.

DANIEL HESS. Witnesses SoLoN U. KnMoN, UHAs. A. Pn'r'rrr. 

